Crystal Engineering on Organic Pigments
Crystal Engineering on Organic Pigments
Crystal Engineering on Organic Pigments
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O<br />
Violet pigment<br />
Example 3: Methyl-dioxazine<br />
C<br />
H 3<br />
H<br />
N<br />
N<br />
O<br />
=> Structure determinati<strong>on</strong><br />
from unindexed powder data<br />
N<br />
Cl<br />
Cl<br />
O<br />
N<br />
N<br />
N<br />
H<br />
CH 3<br />
Insouble in all solvents, even in DMSO or NMP at 200°C<br />
(detecti<strong>on</strong> limit 10 -5 g/L),<br />
Melting point > 300°C (decompositi<strong>on</strong>)<br />
6 polymorphic forms<br />
No single crystals<br />
No suitable powder diagrams<br />
Indexing failed (triclinic)<br />
O
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